$ gem list qtruby4 -r

*** REMOTE GEMS ***

qtruby4 (1.4.9)

$ sudo gem install qtruby4
ERROR:  could not find gem qtruby4 locally or in a repository

# This flies in the face of my world model. I list a gem, it appears, I
try to install it, and it's not there

Any clue would be appreciated!
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